Thermal analysis on the curie temperature of nanocrystalline Ni produced by ball milling

A. S. Bolokang; M. J. Phasha

doi:10.1016/j.apt.2010.07.005

Thermal analysis on the curie temperature of nanocrystalline Ni produced by ball milling

A. S. Bolokang, M. J. Phasha

Council for Scientific and Industrial Research

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

Ball milling on Ni powder at 2, 4, and 6 h interval resulted in a decrease in crystalline sizes of 35, 17 and 13 nm, respectively. Thermal analysis was carried out on unmilled and milled Ni powders. Differential scanning calorimetry curves of milled powder indicated the shifting of magnetic transition temperature peak to lower values whereas thermo-gavimetric curves revealed higher weight loss during heating which confirmed Ni volume expansion on becoming paramagnetic. However, at high temperature the ferromagnetic suppression induced by mechanical milling is lost, hence the normal Curie temperature is restored due to possible grain growth.

Original language	English
Pages (from-to)	518-521
Number of pages	4
Journal	Advanced Powder Technology
Volume	22
Issue number	4
DOIs	https://doi.org/10.1016/j.apt.2010.07.005
Publication status	Published - Jul 2011
Externally published	Yes

Keywords

Ball milling
Curie temperature
DSC-TG
Thermal analysis
Volume nanocrystalline

ASJC Scopus subject areas

General Chemical Engineering
Mechanics of Materials

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10.1016/j.apt.2010.07.005

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abstract = "Ball milling on Ni powder at 2, 4, and 6 h interval resulted in a decrease in crystalline sizes of 35, 17 and 13 nm, respectively. Thermal analysis was carried out on unmilled and milled Ni powders. Differential scanning calorimetry curves of milled powder indicated the shifting of magnetic transition temperature peak to lower values whereas thermo-gavimetric curves revealed higher weight loss during heating which confirmed Ni volume expansion on becoming paramagnetic. However, at high temperature the ferromagnetic suppression induced by mechanical milling is lost, hence the normal Curie temperature is restored due to possible grain growth.",

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N2 - Ball milling on Ni powder at 2, 4, and 6 h interval resulted in a decrease in crystalline sizes of 35, 17 and 13 nm, respectively. Thermal analysis was carried out on unmilled and milled Ni powders. Differential scanning calorimetry curves of milled powder indicated the shifting of magnetic transition temperature peak to lower values whereas thermo-gavimetric curves revealed higher weight loss during heating which confirmed Ni volume expansion on becoming paramagnetic. However, at high temperature the ferromagnetic suppression induced by mechanical milling is lost, hence the normal Curie temperature is restored due to possible grain growth.

AB - Ball milling on Ni powder at 2, 4, and 6 h interval resulted in a decrease in crystalline sizes of 35, 17 and 13 nm, respectively. Thermal analysis was carried out on unmilled and milled Ni powders. Differential scanning calorimetry curves of milled powder indicated the shifting of magnetic transition temperature peak to lower values whereas thermo-gavimetric curves revealed higher weight loss during heating which confirmed Ni volume expansion on becoming paramagnetic. However, at high temperature the ferromagnetic suppression induced by mechanical milling is lost, hence the normal Curie temperature is restored due to possible grain growth.

KW - Ball milling

KW - Curie temperature

KW - DSC-TG

KW - Thermal analysis

KW - Volume nanocrystalline

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JO - Advanced Powder Technology

JF - Advanced Powder Technology

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Thermal analysis on the curie temperature of nanocrystalline Ni produced by ball milling

Abstract

Keywords

ASJC Scopus subject areas

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